Multicast Protocols - HP A6600 Configuration Manual

IPv6 multicast MAC addresses
The most-significant 16 bits of an IPv6 multicast MAC address are 0x3333. The remaining 32 bits are the
least-significant 32 bits of a multicast IPv6 address.
Figure 7 An example of IPv6-to-MAC address mapping

Multicast protocols

Generally, Layer 3 multicast refers to IP multicast working at the network layer. The corresponding
multicast protocols are Layer 3 multicast protocols, which include IGMP/MLD, PIM/IPv6 PIM, MSDP, and
MBGP/IPv6 MBGP. Layer 2 multicast refers to IP multicast working at the data link layer. The
corresponding multicast protocols are Layer 2 multicast protocols, which include IGMP snooping/MLD
snooping, and multicast VLAN/IPv6 multicast VLAN.
IGMP snooping, IGMP, multicast VLAN, PIM, MSDP, and MBGP are for IPv4. MLD snooping, MLD, IPv6
multicast VLAN, IPv6 PIM, and IPv6 MBGP are for IPv6.
This section provides only general descriptions about applications and functions of the Layer 2 and Layer
3 multicast protocols in a network. For more information about these protocols, see related documents in
the IP Multicast Configuration Guide.
Layer 3 multicast protocols
Layer 3 multicast protocols include multicast group management protocols and multicast routing
protocols.
Figure 8 Positions of Layer 3 multicast protocols
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